A kind of cervical intervertebral disk prosthesisTechnical field
This utility model belongs to technical field of medical instruments, particularly relates to a kind of cervical intervertebral disk prosthesis.
Background technology
Vertebra dish between protruding parts is extractd by the traditional operation treatment method of serious cervical spondylosis, makes two adjacent sections section Vertebral body graft be fused together, to reach release compressing and stablize the purpose of spinal column.Being widely used with intervertebral disc bone graft fusion treatment intervertebral disk hernia, a large amount of clinical datas confirm, it has lasting, stable curative effect in terms of releasing the pressure symptom of spinal cord and nerve root, and one of has become as the typical art formula of operation of spondylosis treatment.But, the excision of intervertebral disc, fusion can cause the limitation of activity of Fusion levels, need to be increased mobility by the intervertebral disc of neighbouring vertebra joint and carry out compensatory.Due to the therapeutic modality of this compensatory the dmm of neighbouring section can be caused to increase, activity increases, and then increases the probability of Adjacent segment degeneration.Thus, cervical artificial disc replacement is developed rapidly in the last few years.
Employing cervical intervertebral disc prosthetic replacement is performed the operation, while obtaining spinal nerves effect of easing stress, save physiological activity function (the particularly multilevel cervical spondylosis patient of patients with cervical intercalated disc, postoperative multiple cervical vertebral segment is avoided to combine together, patient's Wry Neck state), and, due to biomechanical principle, decrease the upper and lower vertebra of Fusion levels and save the power born, the degeneration decreasing upper and lower intervertebral space forms prolapse of cervical intervertebral disc and the cervical spondylosis of neighbouring section, the most indirectly reduces the sickness rate of cervical spondylosis.But, cervical intervertebral disk prosthesis implant after human body the highest with the biocompatibility of neighbouring section, be connected unstable or easily come off, and then cause surgical effect to be unable to reach expecting or can not lasting stability.For this reason, it is necessary to structure and shape to cervical intervertebral disk prosthesis are made to optimize, to reach stable therapeutic effect more preferable, more longlasting further on the basis of existing technology.
Utility model content
The purpose of this utility model is for above-mentioned deficiency of the prior art, it is provided that the cervical intervertebral disk prosthesis of a kind of Optimization-type.
For solving above-mentioned technical problem, this utility model adopts the following technical scheme that a kind of cervical intervertebral disk prosthesis, including the first pedestal, the second pedestal, convex body, concaver and fixed plate；Above, the bottom surface of the second pedestal of described first pedestal are evenly distributed with zigzag lug, nib.The most fixing connection between described convex body and the first pedestal, between described concaver and the second pedestal；The bottom of described convex body is hemispherical in projection, and the top of described concaver is the hemispherical concave surface coordinated with described convex body lower slide.Described fixed plate is provided with before and after at least two runs through it and symmetrical through hole；Described fixed plate is fixing with the homonymy of the first pedestal, the second pedestal respectively to be connected.
Further, described first pedestal, the surface of the second pedestal are provided with hydroxyapatite layer.Described first pedestal, the second pedestal surface configuration zigzag lug, nib after, stability that prosthese with neighbouring section couple can be effectively ensured；On this basis, surface spraying hydroxyapatite at described first pedestal, the second pedestal can also obtain good biocompatibility effect further.
Further, described first pedestal, the upright projection of the second pedestal are kidney ellipsoid.
Further, between described convex body and the first pedestal, all it is threaded connection between described concaver and the second pedestal.Or, the bottom of described first pedestal is provided with the first groove, the top of the second pedestal is provided with the second groove, described convex body, concaver respectively with the first groove, the second groove interference fit.
The beneficial effects of the utility model are: the cervical intervertebral disk prosthesis that the utility model proposes realize to cervical vertebral space decompression, recover pathological changes cervical vertebra physiological function on the basis of, can more effectively realize its compatibility with neighbouring section and the stability coupled；It is simultaneously also beneficial to alleviate patient's misery, reduce operation risk, there is higher promotional value.
Accompanying drawing explanation
Fig. 1 is front view of the present utility model.
Fig. 2 is side view of the present utility model.
Fig. 3 is top view of the present utility model.
Fig. 4 is the axonometric chart of this utility model convex body.
Fig. 5 is the axonometric chart of this utility model concaver.
In figure: 1-the first pedestal, 11-zigzag lug, nib, 2-the second pedestal, 3-fixed plate, 31-through hole, 4-convex body, 5-concaver.
Detailed description of the invention
Describe preferred embodiment of the present utility model below in conjunction with the accompanying drawings in detail.
Refer to Fig. 1 to Fig. 5, the utility model discloses a kind of cervical intervertebral disk prosthesis, including first pedestal the 1, second pedestal 2, convex body 4, concaver 5 and fixed plate 3.Above, the bottom surface of the second pedestal 2 of described first pedestal 1 are evenly distributed with zigzag lug, nib 11；The most removably fix between described convex body 4 with the first pedestal 1, between described concaver 5 and the second pedestal 2 and be connected.The bottom of described convex body 4 is hemispherical in projection, and the top of described concaver 5 is hemispherical recessed with what described convex body 4 bottom coordinated；And described convex body 4 slides dynamic cooperation with concaver 5, form the annexation in similar human cervical spine joint, it is possible to relative motion, and then the proper motion function between holding cervical intervertebral disk.Described fixed plate 3 is provided with before and after at least two runs through it and symmetrical through hole 31.Described fixed plate 3 is fixing with the homonymy of first pedestal the 1, second pedestal 2 respectively to be connected.Described first pedestal the 1, second pedestal 2 is connected through the through hole 31 in fixed plate 3 is fixing with the vertebral body of neighbouring section by screw.
Preferably, the surface of described first pedestal the 1, second pedestal 2 is provided with hydroxyapatite layer.Do not have biocompatibility due to metal material, after implanting, the combination effect with osseous tissue is poor, after the surface spraying hydroxyapatite of present first pedestal 1 and the second pedestal 2, can effectively solve this technical problem.Preferably, the upright projection of described first pedestal the 1, second pedestal 2 is kidney ellipsoid.The shape design of described first pedestal the 1, second pedestal 2 should adapt with human cervical spine as much as possible, and it is often in irregularly shaped, and for this, we are preferably designed to kidney ellipsoid or oval or squarish.
Preferably, between described convex body 4 and the first pedestal 1, all it is threaded connection between described concaver 5 and the second pedestal 2.Or, the bottom of described first pedestal 1 is provided with the first groove, the top of the second pedestal is provided with the second groove, described convex body, concaver respectively with the first groove, the second groove interference fit；Further, described first groove, the second groove are preferably designed for swallow-tail form.
Described convex body 4, concaver 5 use high crosslinked polyethylene to make, and this material is to be processed on the basis of ultra-high molecular weight polyethylene, has higher wearability, and cervical vertebra can be made persistently to maintain normal physiology height.Described first pedestal the 1, second pedestal 2 select there is wear-resistant, endurance, the material of the feature such as anticorrosive is made.Such as, the elastic prosthese using rubber to make has physiology and the biomechanics loading functionality being similar to human intervertebral disc, maintains the stable of spinal column and motor function, and the regression that can be prevented effectively from user's neighbouring section is accelerated.
The artificial hip joint of Novel head adopting international standards of intervertebral disk prosthesis disclosed in the utility model identification and the material of knee joint implants, biomechanical property according to cervical vertebra and Chinese's cervical vertebra anatomical features also combine characteristic and the hydroxyapatite material biological property of Co-Cr-Mo alloy, take specific coatings technique to develop.Solve instant and the permanent stable and movable clinical problem in joint after Using prosthesis, thus fill up the multiple cervical intervertebral disk disease of current clinical treatment and retain the blank of cervical vertebra vertebra joint function.
Description the most of the present utility model and application are illustrative, are not wishing to limit in the above-described embodiments scope of the present utility model.In the case of without departing from this utility model scope and spirit, embodiments disclosed herein can be carried out other deformation and change.